18002

Appears in sequences

• a(0) = 1, a(n) = 20*n^2 + 2 for n>0.at n=30A010010
• Shallit sequence S(8,55): a(n) = floor(a(n-1)^2/a(n-2) + 1).at n=4A010918
• Expansion of (8 + 7 x - 7 x^2 - 7 x^3)/(1 - 6 x - 7 x^2 + 5 x^3 + 6 x^4).at n=4A019484
• Becomes prime after exactly 8 iterations of f(x) = sum of prime factors of x.at n=1A047827
• Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2); sequence gives values of u1.at n=37A048189
• Word structures of length n using a 5-ary alphabet.at n=9A056272
• Number of palindromic structures using a maximum of five different symbols.at n=16A056470
• Number of palindromic structures using a maximum of five different symbols.at n=17A056470
• Number of periodic palindromic structures using a maximum of five different symbols.at n=17A056506
• Triangle of partial sums of Stirling numbers of 2nd kind (A008277): T(n,k) = Sum_{i=1..k} Stirling2(n,i), 1<=k<=n.at n=40A102661
• Numbers k such that 15^k - 2 is a prime.at n=13A128458
• T(n,k)=Number of nXk 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.at n=36A209503
• Number of monohedral disk tilings of type C^t_{3,n}.at n=22A296361
• Triangle read by rows, T(n, k) = Sum_{j=0..k} Stirling2(n, j) = Sum_{j=0..k} A048993(n, j).at n=50A359107